/Engine/Source/Runtime/Slate/Public/Framework/MultiBox/MultiBoxBuilder.h
void AddWrapperSubMenu ( const [FText](API\Runtime\Core\Internationalization\FText) & InMenuLabel, const [FText](API\Runtime\Core\Internationalization\FText) & InToolTip, const FOnGetContent & InSubMenu, const [FSlateIcon](API\Runtime\SlateCore\Textures\FSlateIcon) & InIcon, const [FUIAction](API\Runtime\Slate\Framework\Commands\FUIAction) & UIAction )